<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <title>Document</title>
</head>
<body>
<!-- 1.准备好一个“容器” -->
<div id="test"></div>
<!-- 引入react核心库 -->
<script src="../js/react.development.js"></script>
<!-- 引入react-dom。用于支持react操作DOM -->
<script src="../js/react-dom.development.js"></script>
<!-- 引入babel，用于将jsx转为js -->
<script src="../js/babel.min.js"></script>
<script type="text/babel">
    class Weather extends React.Component {
        //初始化状态
        state = {isHot: false, wind: "微风"};

        render() {

            const {isHot, wind} = this.state;
            return (
                <h1 onClick={this.changeWeather}>今天天气很{isHot ? "炎热" : "凉爽"},{wind}</h1>
            );
        }
        //自定义方法————要用赋值语句的形式+箭头函数
        changeWeather = () => {
            //箭头函数没有this，它会找外层的this
            const isHot = this.state.isHot;
            this.setState({isHot: !isHot});
            // console.log(this);
        };
    }

    ReactDOM.render(<Weather/>, document.getElementById("test"));
</script>
</body>
</html>
